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1/2-(x/30) = 3*x+33/90 // - 3*x+33/90
1/2-(x/30)-(3*x)-(33/90) = 0
1/2-(x/30)-3*x-11/30 = 0
2/15-91/30*x = 0 // - 2/15
-91/30*x = -2/15 // : -91/30
x = -2/15/(-91/30)
x = 4/91
x = 4/91
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